KR20190043476A - Exhaust gas after-treatment system and method for the exhaust gas after-treatment - Google Patents

Abstract

The present invention relates to a post-treatment system for exhaust gas of a new type and a method for post-treatment of exhaust gas of a new type. The exhaust gas post-treatment system (2) for an internal combustion engine (1) has a particle separator (3) arranged on the lower part of the internal combustion engine (1) comprising at least a particle separating module (6) to remove soot and ash particles from exhaust gas. The exhaust gas to be cleaned can be supplied to the particle separator (3) through at least an exhaust gas supply line in the particle separator (3), and the exhaust gas cleaned in the particle separator (3) can be discharged from the particle separator (3) after passing through at least one exhaust gas discharge line. Each particle separating module (6) includes multiple exhaust gas flow paths (10) through which the exhaust gas flowing can pass. The exhaust gas discharged from the exhaust gas supply line through the exhaust gas flow path can be guided toward an exhaust gas discharge line. The boundary of the exhaust gas flow path (10) is limited by a flow-control element (8, 9) adjacent.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas aftertreatment system and an exhaust gas post-

The present invention relates to an exhaust gas aftertreatment system. The present invention also relates to a method for exhaust gas aftertreatment.

At least one other exhaust gas after-treatment assembly arranged on the upstream side of the particle filter as viewed in the flow direction of the exhaust gas, and / or at least one exhaust gas after-treatment assembly arranged at the downstream side of the particle filter as viewed in the flow direction of the exhaust gas There is known an exhaust gas aftertreatment system of an internal combustion engine that includes one other exhaust aftertreatment assembly as an exhaust aftertreatment assembly. In view of the flow direction, the exhaust aftertreatment assembly located upstream of the particulate filter is an oxidation catalytic converter specifically for oxidizing nitrogen monoxide (NO) to nitrogen dioxide (NO ₂ ). As seen in the flow direction, the exhaust gas after-treatment assembly located downstream of the particle filter may be a silencer. In particular, as viewed in the flow direction of the exhaust gas flow, the oxidation catalytic converter for oxidation of NO to NO ₂ is located on the upstream side of the particle filter, and the oxidation of NO to NO ₂ in the oxidation catalytic converter is expressed by the following equation With the help of residual oxygen (O ₂ ) contained in the exhaust gas flow according to FIG.

2 NO + O ₂ ? 2 NO ₂

During the oxidation of such nitrogen monoxide to nitrogen dioxide, the equilibrium of the oxidation reaction at high temperature is on the side of the nitrogen monoxide. This results in a significant limitation of the rate of nitrogen dioxide that can be achieved at high temperatures.

In the particle filter, the nitrogen dioxide obtained in the oxidation catalytic converter is converted into carbon-containing particles, so-called soot, and carbon monoxide (CO), carbon dioxide (CO ₂ ), nitrogen (N ₂ ) and nitrogen monoxide NO). In this process, for passive regeneration of the particle filter, successive removal of the carbon-containing particulate material or soot accumulated in the particle filter is effected, wherein the conversion described above is effected according to the following equation.

2 NO ₂ + C 2 NO + CO ₂

NO ₂ + C? NO + CO

2 C + 2 NO ₂ → N ₂ + 2 CO ₂

Particularly, with this natural regeneration of the particle filter, when no complete conversion of the carbon-containing particulate matter or soot accumulated in the particle filter can be made, the carbon ratio or soot ratio in the particle filter increases, Which results in an increase in so-called exhaust gas backpressure on the internal combustion engine which is ultimately connected upstream of the exhaust gas aftertreatment system. Increasing exhaust gas backpressure on the internal combustion engine reduces the power of the internal combustion engine and causes an increase in fuel consumption.

It is already known in the art to provide a catalytic coating on the particle filter in order to avoid the increase of the carbon-containing particulate matter or soot in the particle filter and hence clogging of the particle filter. Here, a platinum-containing coating is preferably used. However, the use of such a particle filter with a catalyst coating can only prevent the filling of the carbon-containing particulate material, that is, the particulate filter with the soot, to an inappropriate extent only.

In particular, when the internal combustion engine in which the exhaust gas aftertreatment system is operated is operated with a high sulfur-containing fuel, such as, for example, heavy fuel oil, as in the case of a ship's diesel internal combustion engine, As a result of the high generation of soot and soot, there is a further problem that clogging of the particle filter of the exhaust aftertreatment system can occur as well. Particularly, in the case of an internal combustion engine operated with heavy oil, the maintenance interval of the particle filter can be significantly shortened by generated ash and soot, so that the practical operation of the exhaust gas aftertreatment system is no longer possible.

Thus, for the reasons stated above, it has already been known from practice to replace the particle filter in the exhaust aftertreatment system with a filterless particle separator. In the case of a particle separator, the exhaust gas does not flow through any filter media, and the exhaust gas flow is guided and deflected along a textured surface for separating particles rather.

From EP 1 072 765 B2, a method for separating particles from the exhaust gas of an internal combustion engine is known. The particles are separated by diffusion in the dead zone of the flow. Separation of the particles from the exhaust gas by diffusion is easily possible according to methods known from EP 1 072 765 B2, but in the case of unstable operation of the internal combustion engine, suitable NO ₂ is frequently available There is a problem in that it does not occur. For this reason, the particle separator must store the particles until the appropriate NO ₂ for the subsequent oxidation of the carbon becomes available. However, the particle filter should not be blocked in the process.

Other particle separators are known from DE 10 2008 029 520 A1. In this particle separator, the exhaust gas is also steadily biased to separate the particles from the exhaust gas.

There is a need for an exhaust aftertreatment system having a particle separator, wherein the separated particles, especially carbon particles, can be stored intermediate for subsequent oxidation and can discharge soot and ashes to avoid clogging of the particle separator. Starting from this, the invention is based on the objective of finding out a new type of exhaust gas after-treatment system and a new type of exhaust gas after-treatment.

This object is solved by an exhaust gas aftertreatment system according to claim 1. The exhaust aftertreatment system comprises at least one particle separator module for removing soot and particulates from the exhaust gas and the exhaust gas to be cleaned can be supplied to the particle separator via at least one exhaust gas feed line, The exhaust gas cleaned in the separator can be discharged from the particle separator through at least one exhaust gas discharge line, each particle separator module including a plurality of exhaust gas flow passages through which the flowing exhaust gas can pass, Through this exhaust gas flow passage, the exhaust gas from the exhaust gas supply line can be guided in the direction of the exhaust gas discharge line, the exhaust gas flow passage is bounded by the neighboring flow-control element, The element may comprise a flow deflection zone having a turbulent exhaust gas flow in the exhaust gas flow passage and / Wherein each particle separator module includes a plurality of scrubbing passages through which exhaust gases and / or compressed air may flow, wherein each scrubbing passageway includes a plurality of scrubbing passages, This cleaning passage extends transversely to the exhaust gas flow passage and is likewise delimited by the flow-control element, at least in this section of the flow-control element separating the exhaust gas flow passage from the cleaning passage, through a rinsing passage A recess is provided for the passage of the flowing exhaust gas and / or for the passage of the pressurized air flowing through the cleaning passageway, and at the surface of the flow-control element facing the exhaust gas flow passage via this recess, / ≪ / RTI >

In the case of particle filters of the exhaust aftertreatment system according to the present invention, the carbon particles can be intermediate stored for oxidation and further the soot and ash can be drained to avoid clogging of the particle filter. The carbon particles are separated by diffusion and / or convection of the particles on the surface of the exhaust gas flow passage. Through the cleaning passageways which can guide compressed air and / or exhaust gases, ashes and soot can be effectively removed from the particle filter.

According to another refinement, the surface of the flow-control element facing the exhaust-gas flow path forms a microstructure. Preferably, the microstructure extends the effective surface area of the macroscopic structure, and the microstructure preferably has a roughness of 0.05 [mu] m to 50 [mu] m. The microstructure on the surface of the flow-control element facing the exhaust flow path enhances the separation of particles from the exhaust gas through diffusion and / or convection. Here, the roughness of the microstructure between 0.05 μm and 50 μm is particularly desirable for forming a thin stagnating boundary film of discrete particles with a tendency to zero flow velocity. Thus, the particles can be prevented from being separated again by the flow.

According to another refinement, the flow-control element comprises a flat or two-dimensionally contoured flow-control element, which is alternately designed in a sandwich or stacked fashion, forming a plurality of layers of the exhaust gas flow passage and the cleaning passage, And a flow-control element formed in a waveform or three-dimensionally contoured. Preferably, the flow-control element contoured three-dimensionally as a macroscopic structure comprises a flow-guiding contour portion extending in the direction of the exhaust gas flow passage, a flow-accumulating contour portion extending transversely to the direction of the exhaust gas flow passage, And a flow-guiding opening.

A flow-control element sandwiched or stacked up and arranged one above the other, forming or boundary-defining the exhaust gas flow passage and the cleaning passage, is used to separate the carbon particles by diffusion and / or convection, .

According to another advantageous further development, the flow-controlling element has a wall thickness of from 40 μm to 150 μm, preferably from 40 μm to 100 μm, particularly preferably from 40 μm to 60 μm. This thin wall thickness of the flow-control element allows for efficient flow control with a compact design in each case, effective separation of carbon particles and efficient cleaning of the particle separator.

A method for exhaust after-treatment according to the present invention is defined in claim 14.

Further preferred refinements of the invention are obtained from the dependent claims and the following detailed description. Exemplary embodiments of the present invention are not limited thereto, but are described in further detail with reference to the drawings.

1 is a block diagram of an exhaust aftertreatment system;
2 is a perspective view of an exhaust aftertreatment system;
Figure 3 is a detail view of Figure 2;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention presented here relates to an exhaust gas aftertreatment system for an internal combustion engine, preferably for example an internal combustion engine used on a ship operating with a sulfur-containing fuel, such as heavy oil.

1 shows an exemplary embodiment of an exhaust gas aftertreatment system 2 located on the downstream side of the internal combustion engine 1. The exhaust aftertreatment system 2 of FIG. 1 includes a particle separator 3 located on the downstream side of the internal combustion engine.

On the downstream side of the particle separator 3 as viewed in the flow of the exhaust gas upstream of the particle separator 3 and in the direction of flow of the exhaust gas, at least one other exhaust aftertreatment component of the exhaust gas after- It is pointed out here that it can be located in each case. On the upstream side of the particle separator 3, for example, an oxidation catalytic converter for oxidation of NO to NO ₂ can be located. On the downstream side of the particle separator 3, for example, a silencer can be located.

The exhaust gas 4 to be cleaned can be supplied to the particle separator 3 via an exhaust gas supply line not shown in detail.

After the exhaust gas to be cleaned flows through the particle separator 3, the cleaned exhaust gas 5 is preferably exhausted from the particle separator 3 via at least one exhaust gas discharge line not shown in detail .

In the block diagram of Figure 1, the particle separator 3 comprises two particle separator modules 6. These two particle separator modules 6 shown in Figure 1 are connected in parallel.

It is pointed out here that, in addition to or in addition to this particle separator module 6 connected in parallel, the particle separator 3 may also comprise a series connected particle separator module 6.

Each of the particle separator modules 6 of the particle separator 3 includes a plurality of exhaust gas flow passages 10 (see FIGS. 2 and 3) through which the flowing exhaust gas can pass, The exhaust gas from the exhaust gas supply line can be guided in the direction of the exhaust gas discharge line. The exhaust gas flow passage 10 is preferably made by means of adjacent metal and / or ceramic and / or quartz containing and / or glass containing and / or silicon containing and / or silicate-containing flow control elements 8, These flow control elements are arranged in the exhaust flow passage 10 in a macroscopic structure in the millimeter size range or in the centimeter (cm) size range, in particular in the flow deflection zone with turbulent exhaust gas flow and / Forming or delimiting a flow zone having four zones of flow and / or different flow rates. In addition to the exhaust gas flow passage 10 in which the carbon particles are separated in particular by carbon diffusion and / or convection, each of the particle separator modules 6 has in each case an exhaust gas and / A plurality of cleaning passages 11 which can pass therethrough, the cleaning passages extending transversely to the exhaust gas flow passage 10 and likewise delimited by flow-control elements 8, 9.

Part or a section of the flow-control element 8, 9 thus delimits one of the exhaust flow paths 10 on the first side and one of the cleaning passages 11 on the second side Boundaries. Control elements 8, 9, on the one hand, which separate the exhaust gas flow passage 10 and on the other hand the cleaning passage 11 from each other, or at least these sections of the flow- A recess for passing the exhaust gas flowing through the cleaning passage 11 and / or for passing the compressed air flowing through the cleaning passage 11 is introduced, and through this recess, the exhaust gas flow path The surface or surface sections of the flow-control elements 8, 9 facing the exhaust passage 10 and / or the exhaust passage 10 are arranged such that the exhaust gas and / or the compressed gas flowing through the cleaning passage 11 flows through these recesses, The soot and / or ashes can be cleaned by cleaning the soot and / or ashes of the surface or surface section of the flow-control element 8, 9 facing the flow control element 10.

The flow-control elements 8, 9 are on the one hand a flat plate-type and thus two-dimensionally contoured flow-control element 8 and on the other hand a wave-form and thus a three-dimensionally flow- 9 and 9, these flow-control elements are alternately arranged in a sandwich or stacked manner up-and-down with respect to each other, that is to say exhaust gas flow passage 10 and cleaning passage 0.0 > 11). ≪ / RTI >

The flow-controlling elements 8, 9 preferably have a wall thickness in this case of from 40 μm to 150 μm, preferably from 40 μm to 100 μm, particularly preferably from 40 μm to 60 μm, Film type.

The flow-control elements 8, 9 may also be embodied as an expanded metal layer or a lattice.

The three-dimensionally contoured flow-control element 9 comprises, in this case as a macroscopic structure, a flow guide contour 12 extending in the direction of the exhaust-gas flow passage 10 and a flow- Forming a flow-accumulating contour portion 13 that extends transversely to the direction of the exhaust gas flow passage 10, such as the opening 14. The three-dimensionally contoured flow-control element 9 may be a corrugated expanded metal layer.

In each case, the two-dimensionally contoured flow-control element 8 separates two adjacent three-dimensionally contiguous flow-control elements 9 from each other and forms a flow-guiding opening 15 as a macroscopic structure, . The two-dimensionally contoured flow-control element 8 may be a smooth corrugated expanded metal layer.

The exhaust gas flowing through the exhaust gas flow passage 10 of the layer and accumulating in the region of the flow-accumulating contour 13 of this layer flows through the flow-guiding opening 14 to the other exhaust gas flows Flows into the passage 10 or into the flow cleaning passage 11 and into the exhaust flow passage 10 of the same layer through the opening 14 of the subsequent flow-guide contour 12, In the region of the flow passage, the exhaust gas can then again flow away in the direction of the exhaust gas discharge line until the exhaust gas once again enters the region of the subsequent flow-storing contour 13.

Through this subsequent flow-accumulating contour 13, the exhaust gas is introduced into the flow-guiding passageway 10 of the neighboring layer via the opening 14 or into the subsequent cleaning passageway 11 and the subsequent flow- Flows through the opening 14 of the portion 12 again into the exhaust gas flow passage 10 of the same layer.

Thus, while the exhaust gas flowing through the flow-guiding passageway 10 does not flow through any filter medium, the exhaust gas forces the flow deflection many times, and in such a process, Can be separated by diffusion and / or convection in the region of the flow-accumulating contour 13 formed thereon.

In order to facilitate the separation of the particles from the exhaust gas by diffusion and / or convection, microstructures, i.e. structures in the micrometer (mu m) range, are formed on the flow-control elements 8, 9, 10 on the surface or surface section of the flow-controlling element 8, 9 to set a roughness of 0.05 to 50 microns, preferably in the region of said surface, to thereby effect the effective surface area of the macroscopic structure Expand.

In particular, when the microstructure has a roughness of 0.05 占 퐉 to 50 占 퐉, a thin identity boundary film having a tendency of zero velocity can be formed in the region of the macrostructure. This prevents the particles separated in the region of the roughened surface from being separated again by the exhaust gas flow.

In particular, microstructures that can be formed in the region of the flow-accumulating macroscopic structure can be formed by mechanical processing of each surface and / or by chemical treatment.

This allows the microstructure to be brushed and / or polished so that the microstructure is then formed as a brushed and / or ground structure and / or as a scraped and / or pinned and / or stamped and / Or roughness of the surface on the surface of the macroscopic structure by grinding and / or scraping and / or blasting and / or stamping and / or needling molding. Moreover, the microstructure can be formed by chemical treatment such as etching and / or zinc plating and / or anodic oxidation so that the microstructure is then formed as an etched structure and / or a zinc plated and / or anodized structure It is possible. Furthermore, a corona treatment of the surface to form the microstructure can be made.

Moreover, alloys of the preferred metallic materials of the flow-controlling elements 8, 9 can be applied, so that the surface structure of these flow-controlling elements changes under the influence of heat and / or under the influence of fluctuations in the pH-value.

An example of such is the introduction of aluminum into the alloy of the flow-control elements 8, 9. At high temperature, aluminum migrates to the surface, where it forms an aluminum bundle. The alloying material for the flow-controlling element can be selected such that its surface can be easily corroded or oxidized.

Therefore, it is possible to increase the roughness of the surface in the region of the exhaust gas flow passage 10 during operation of the internal combustion engine by the oxidizing environment and the corrosive environment of the exhaust gas. This is also successful after a short running-in step so that the mechanical or chemical treatment of the surface of the flow-control element can be omitted at this time.

It is also possible to apply the metal powder with subsequent fixation to the flow-control element of the powder by brazing or sintering, in order to form the defined microstructure with the specified roughness.

As already explained, the flow-control element 9 is contoured in three dimensions. In addition, the flow-control element 9 may be corrugated and / or contoured in accordion fashion.

Control element 8, which serves as the surface of the flow-control element facing the exhaust-gas flow passage 10 and in particular the flow-accumulating structure 13, which acts as a particle separator through diffusion and / 9 are introduced into the sections of the flow-control elements 8, 9, in particular via perforation or slits, through these recesses, through the cleaning passages 11 The exhaust gas and / or the compressed air is steered into the exhaust gas flow passage 10 and thus the soot and / or ashes are removed from the surface.

The cleaning passage 11 in this case extends transversely with respect to the exhaust gas flow passage 10 and in particular the cleaning passage 11 communicates with the exhaust gas flow passage 10 at an angle of 20 ° to 160 °, Preferably an angle of 50 to 120, particularly preferably an angle of 80 to 100, in particular an angle of 90. Here, the cleaning passage 11 is preferably provided with exhaust gas guided through the cleaning passage 11, or compressed air guided through the cleaning passage 11 through the recess-or-claw-like flow-control element 8, 9 In order to guide it into the corresponding section of the < / RTI >

The dimensions of the macroscopic structure are preferably in the millimeter range or in the centimeter range, and are thus several times larger than the dimensions of the largest separated particles. The macroscopic openings for flow are preferably arranged such that they facilitate the formation of a turbulent flow. Furthermore, the formation of the quadrant of the flow is facilitated. Regions having different flow rates are formed.

The flow-control elements 8, 9 of each particle separator module 6 are enclosed in a canister to provide each of the particle separator modules 6 in this manner. A plurality of particle separator modules 6 may be positioned within the common housing 17 to form a parallel connection and / or a series connection of the particle separator module 6. Figure 1 very schematically shows this housing 17 for a plurality of particle separator modules 6 and the canister 16 for each of the particle separator modules 6. [ The particle separator module 6 is preferably arranged in the common housing 17 in such a manner that the particle separator module 6 can be removed from the housing 17 in a non-destructive manner.

Through the canister 16, the neighboring particle separator module 6 is guided through the taper and cone of the canister 16 in accordance with a key-lock principle, for example via the contour inserted into each other, And can be sealed to each other.

Through the housing 17 of the particle separator 3, the exhaust gas to be cleaned can be supplied to the particle separator module 6, and the cleaned exhaust gas can be exhausted through the housing 17. The compressed air guided through the cleaning passage 11 of the particle separator module 6 can also be supplied thereto via the housing 17 of the particle separator 3. Here, the collection chamber for the exhaust gas and the collection chamber for the compressed gas are arranged in the housing (not shown) so as to guide the collection chamber, that is, the exhaust gas and the compressed air coming out of this collection chamber in the direction of the exhaust gas flow passage 10 and the cleaning passage . The compressed air guided through the cleaning passage 11 preferably travels from the particle separator module 6 to the particle separator module 6.

For exhaust gas post-treatment, the exhaust gas flow passage 10 and the cleaning passage 11 preferably do not pass the flow at the same time. In particular, particularly when the exhaust aftertreatment system comprises two or more particle separators 3, and specifically when the first particle separator 3 is used for exhaust gas cleaning and in this process, When the second particle separator 3 is guided through the exhaust gas flow passage 10 of the separator, the exhaust gas and / or compressed air is guided through the cleaning passage 11 of the second particle separator, In the region of the second particle separator 3, the exhaust gas flow through the exhaust gas flow passage 10 of the second particle separator is then preferably shown to be completely stopped or alternatively reduced.

In addition, the above-described method results in the extraction of these solids swirling from the particle separator 3 and subsequent collection in a suitable vessel, in a cleaning step in which the soot and ash swirl. The container may be emptied at a later time.

To produce a particle separator according to the invention, flow-control elements 8, 9 are provided and the microstructure on the flow-control elements 8, 9 can be formed before or after the formation of the macroscopic structure.

The formation of the microstructure is preferably carried out by blasting and / or grinding and / or stamping and / or needling and / or etching and / or zinc plating and / or anodizing and / or brushing and / or corona irradiation.

In order to manufacture the particle separator module 6, the basic body for the flow-controlling elements 8, 9 is initially subjected to particle blasting and / or grinding and / or stamping and / or needling and / The procedure can be performed. Thereafter, the macroscopic structure is formed by molding or soldering or welding, and in this way a flow-control element 9, which is contoured in three dimensions, is formed. By stamping or punching, openings 14,15 can be created which form the connection of the adjacent exhaust flow path 10 in the finished state of mounting. Thereafter, the stack of flow-control elements 8, 9 preferably comprises a two-dimensionally contoured flow-control element 8 and a three-dimensionally contoured flow-control element 9 ). In particular, this stack may preferably be formed into a substantially cylindrical body by S-shape twisting perpendicular to the direction of travel of the exhaust gas flow passage. These bodies can be arranged in the canister 16. The stack-up or cylindrical-body flow-control elements 8, 9 arranged one above the other can be permanently coupled to each other, for example by welding or soldering. The microstructure may also be formed after completion of the macroscopic structure. In order to form the microstructure, the stack formed by laminating the flow-control elements 8, 9 may have microstructures on all surfaces by immersion into the etching solution and subsequent removal of the etching solution.

1: Internal combustion engine 2: Exhaust gas post-treatment system
3: Particle separator 4: Exhaust gas to be cleaned
5: cleaned exhaust gas 6: particle separator module
7: Compressed air 8: Flow-control element
9: Flow-control element 10: Exhaust gas flow path
11: cleaning passage 12: flow-
13: flow-accumulating contour 14: flow-guiding aperture
15: flow-guide opening 16: canister
17: Housing

Claims (15)

An internal combustion engine (1) having a particle separator (3) arranged on the downstream side of an internal combustion engine (1), comprising at least one particle separator module (6) for removing soot and reclaimed particles from the exhaust gas. An exhaust aftertreatment system (2) comprising:
The exhaust gas to be cleaned can be supplied to the particle separator 3 via at least one exhaust gas feed line and the cleaned exhaust gas is introduced into the particle separator 3 from the particle separator 3 via at least one Can be discharged through an exhaust gas discharge line,
Each of the particle separator modules (6) includes a plurality of exhaust gas flow passages (10) through which exhausted exhaust gas can pass, and the exhaust gas from the exhaust gas feed line Can be guided in the direction of the exhaust gas discharge line,
The exhaust-gas flow passage (10) is delimited by neighboring flow-control elements (8, 9) and the flow-control element comprises a flow deflector with a turbulent exhaust flow in the exhaust- Limiting the macroscopic structure, such as zones of flow and / or flow zones having different dead zones and / or different flow rates,
Each of said particle separator modules (6) comprises a plurality of cleaning passages (11) through which exhaust gases and / or compressed air can pass, said cleaning passages being transverse to said exhaust gas flow passage And is likewise delimited by the flow-control element (8, 9)
A section of the flow-control element (8, 9) for separating the exhaust gas flow passage (10) from at least the cleaning passage (11) is provided with a passage for the passage of the exhaust gas flowing through the passage (8, 9) facing the exhaust gas flow passage (10) via the recess, and / or a recess for the passage of compressed air flowing through the cleaning passage (11) Wherein the soot and / or ash can be cleaned at the surface of the exhaust gas treatment system. The exhaust aftertreatment system according to claim 1, characterized in that the surface of the flow-control element (8, 9) facing the exhaust flow path (10) forms a microstructure. 3. The method of claim 2, wherein the microstructure comprises a ground structure and / or a stamped structure and / or a needle structure and / or a brushed structure and / or a pinned structure and / or an etched structure and / or an anodized structure and / / RTI > and / or the zinc plated structure. 4. The exhaust gas aftertreatment system according to claim 2 or 3, wherein the microstructure has a roughness of 0.05 to 50 mu m. 5. The exhaust aftertreatment system according to any one of claims 2 to 4, wherein the micro structure enlarges an effective surface area of the macro structure. 6. The exhaust aftertreatment system according to any one of claims 1 to 5, wherein the macroscopic structure has a dimension in the range of mm or cm and / or the microstructure has a dimension in the range of mu m. 7. A method according to any one of claims 1 to 6, wherein the cleaning passage (11) and the exhaust gas flow passage (10) have a length of 20 to 160 degrees, preferably 50 to 120 degrees, Deg.] To 100 [deg.]. 8. A device according to any one of the preceding claims, characterized in that the flow-control element (8, 9) comprises a sandwich-type or a multi-layer structure which forms a plurality of layers of the exhaust gas flow passage (10) Characterized in that it comprises a two-dimensionally contoured flow-control element (8) and a three-dimensionally contoured flow-control element (9) designed in a stacked and alternating manner. 9. A process according to claim 8, characterized in that the flow-controlling element (8,9) has a wall thickness of 40 [mu] m to 150 [mu] m, preferably 40 [ Exhaust gas aftertreatment system. 10. A method according to claim 8 or 9, characterized in that the flow-control element (9), which is contoured in a three-dimensional manner as a macroscopic structure, comprises a flow-guiding contour (12) extending in the direction of the exhaust- Is expanded into a flow-accumulating contour (13) and a flow-guiding opening (14) which extend transversely with respect to the direction of the passageway. 11. An exhaust aftertreatment system according to any one of claims 8 to 10, characterized in that said two-dimensionally contoured flow-control element (8) as a macroscopic structure forms a flow- . 12. An exhaust aftertreatment system according to any one of the preceding claims, characterized in that the flow-control elements (8, 9) of each of said particle separator modules (6) are enclosed by a canister. 13. A device according to any one of the preceding claims, characterized in that a plurality of said particle separator modules (6) are arranged in a common housing and the particle separator modules are connected in parallel and / or in series in a common housing The exhaust gas aftertreatment system. 14. The method according to any one of claims 1 to 13, characterized in that the swirling ash and soot particles in the cleaning step of the particle separator module (6) are extracted from the particle separator module (6) The exhaust gas aftertreatment system. Process for the exhaust gas aftertreatment of exhaust gas from an internal combustion engine, with an exhaust gas aftertreatment system (2) comprising a particle separator (3) connected in parallel, according to any one of claims 1 to 13 The second particle separator 3, particularly when the first particle separator 3 is used for exhaust gas cleaning and in this process the exhaust gas is guided through the exhaust gas flow passage 10 of the first particle separator, The exhaust gas and / or the flowing compressed air is guided through the cleaning passage (11) of the second particle separator, and in this process, the exhaust gas flowing through the exhaust gas flow passage (10) of the second particle separator Wherein the gas flow is reduced or prevented.

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